Ngons and messy Topology on flat Surfaces
Topology Guides Guides for 3d Artists first you should learn the basics to have a clean topology and not the clutter that is seen in your model, so you will achieve a good quality render and you will make your work easier by reducing the render time
You can use Loop Tools Addon, it is in user preferences addons, activate it and it will appear in edit mode when you press W
Example to create a good 
Apply Smooth in Object Mode 
and maybe you can apply a subdivision surface modifier  
You can also read many very good answers that are here, and do not wait for the magic addon to arrive, which may never arrive

Topology

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when finished remember to apply scale and rotation, so that when you do not have scaling problems, remember to adjust the normals of your model

8.1 Object Mode

8.2 CTRL + A, Scale and Rotation

8.3 Edit Mode

8.4 select all and apply CRTL + N